I was using H2O2 until I got fungus gnats from the rot. Then, I had to stop using H2O2 so it didn't kill the bacteria in my mosquito dunk to combat the gnats. When I stop one the other becomes a problem.

I've gone back and forth with WH in several different threads over the same exact problems that were plaguing me a year ago and have had no luck, but here is a run down of my situation:

In flower am running 2 DWC buckets on a 19W industrial pump and 4"x1" cylindrical air stones. My water temp is 63-68 and my air temps are 65 at night to around 78-80 in the day. I am feeding them Pure Blend Pro Bloom, Liquid Karma, and Hygrozyme at about 1200 PPM.

Right now I have pHed water and a small bit of H2O2 in a bottle that I use to spray the gunk off the roots, and it comes off, but the problem is that the roots are not growing at all.

I have two mothers also in DWC and my PK has thick white mass of roots and only a little bit of black and my MK mother has these dead orange looking roots with one end that has white shoots coming off of it. I am only feeding the mothers PBP grow and a little bit of Super Thrive at 1200 PPM with a pH of about 5.8.

I have 5 week old cuttings in E&F that are also struggling to grow roots, even though my system is cleaned and scrubbed weekly. One of them looks like it is going to start popping out roots, but then they shrivel up and turn black. Above ground, the plant looks fairly healthy though. I am feeding these PBP grow and Hygrozyme.